40dcoe's are not enuf for 9k rpms? currently i am trying to source for the l28e n.a pistons that are supposed to be flat-tops rite?but they're hard to come by .wht kind of compression will i roughly get if i use a thinner headgasket(i can get metal headgaskets) 0.7mm and just shave the head 0.4mm off?

But a close chamber W53 or Closed chamber A87 is fine Not all A87 are closed.
Enlarge the intake ports to 1.5 inch and you more or less have SSS spec head.
be honest its nothing really special.
Just best to have the head done by someone who has done L series heads. I seen some people matchpoert the head to 1.5 but the casting is getting thin and could crack when slightly overheated or stressed.

also you caN SPEN MONEY ON THE 280Z VALVES BUT NEEDS NEW SEATS ALSO AND THAT INVOLVES ALOT MORE MACHINE WORK AND i SAY NOT REALLY WORTH IT ON MOST MOTORS

I have an L18 in my 510 (from 73 610), with about 6k miles on the rebuild, it has been bored .030 over.
I dont think my setup is as potent as it could be. I dont get a lot of low end, but then I am also not sure if it has a stock cam. (Will check reciepts) after about 3500 RPM is when the motor takes off, but with the stock peashooter exhaust, it is limited by back pressure it seems as far as revving very high before losing power.

I will follow this thread to see what you do man...not trying to threadjack...
(Anyone think I should toss my Weber 32/36 DGV for something better?)

seriously, are twin 40dcoe's good enough for a worked l18? i was thinking of going for a 288 duration cams...
Also, are the rods from the fj20e similar to the ones on the l18, can they be used on the l18 since fj20e rods are floating pin types...

The L16/18/20B/L24/26/28/Z18/20/22/24 all have the same rod journal diameter. So yes it will 'fit' the L16 crank. BUT you will need a piston with a pin height of 40.8 at the most, to reach the deck height.

"Nissan 'shit the bed' when they made these, plain and simple." McShagger510 on flattop SUs

wow,its been a while since i got back to this, well sorry to bring this zombie thread back but i'va had a lot of fun with the 510 and recently during the last track session the engine decided to give way, and took along rod bearings with it, suspected it was a lack of oil pressure coming due to the massive oil cooler i recently fitted so now a rebuild is underway.specs of the motor i ran:l18 fully lightened crank and balancedl16 rodsoversized l18 pistons and shaved them downlightened flywheelported and polished w53 cyl headweber 45mm dcoe'smsd 6aldo you guys have any recommendation of cams that i could get ? who sells em? i seriously am lacking top end power on circuit , any ideas on this ?